I have had a 2010 3.5is for just over a year now and absolutely love it. It has only done 40000 miles and has been well cared for with a full service history. I have a BMW extended warranty but so far there have had no issues. It is a weekend car and not my daily drive so The mileage will remain low. Petrol consumption averages out at about 30mpg but depends on how you drive it. Needless to say these are complex cars and can go wrong in an expensive way if you are unlucky. However if you take care with your research and are patient I am sure you will find a good car. As far as driving goes the E89 is more of a GT and won’t be as sharp and responsive as your E85. It will, however, be more comfortable for daily use and particularly for longer journeys. Having had an E85 in the past, would I swop back. No, the E89 better suits my needs. Good luck with your research.